One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,5)(4,8)(6,7)(9,10,14,12)(11,16,15,13)(19,22)(24,26)(27,29)(31,32)(2,7)(3,8)(10,12)(13,16)(17,18,23,20)(19,24,22,26)(21,28,30,25)(27,32,29,31)(1,3,6,8)(2,4,7,5)(10,12)(11,15)(17,19,23,22)(18,24,20,26)(21,27,30,29)(25,31,28,32)(1,4,6,5)(2,3,7,8)(9,11)(10,13)(12,16)(14,15)(17,20,23,18)(19,26,22,24)(21,28,30,25)(27,32,29,31)(1,2)(3,4)(5,8)(6,7)(9,12,14,10)(11,16,15,13)(17,21,23,30)(18,25,20,28)(19,27,22,29)(24,31,26,32)(1,5,6,4)(2,8,7,3)(9,13,14,16)(10,15,12,11)(17,22,23,19)(18,26,20,24)(21,29,30,27)(25,32,28,31)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.